The type of cell division during gamete formation in haploid parents is mitotic and that in diploid parents is meiosis

Angiosperms perform double fertilization in which one male gamete fuses with the egg to form zygote and the other gamete fuses with diploid secondary nucleus to form the triploid primary endosperm nucleus.

Bisexual flower possesses both stamens and the pistil. The stamens are the male reproductive organs which must be removed in order to get the flower converted into female. Stamens are removed one after the other with the help of a pair of foreceps. This is done in the bud condition of a flower and then the pistil is protected till maturity for pollination with desired pollen grains. 

External fertilization is primitive and internal fertilization is advance. External fertilization is not advanced because it occurs outside the body of the organisms, mostly in water in most aquatic organisms so that a large number of gametes are wasted. Moreover, the offsprings are not protected from predators and their survival threatened.

(A) c is a seed that produces new plant.
(B) c is a seed that produces new plant.
(C) c is an adventitious bud that produces a new plant.
(D) b is an eye that has a bud.

Suresh has chosen the correct of sugarcane stem. It is because the bud formation takes place at the node of the stem.

Earthworm, Sponge, Tapeworm, Leech.

Gardener did a mistake by selecting a monocotyledonous stock for grafting a dicotyledonous scion. Usually grafting is between two dicotyledonous plants where cambium develops at the place of grafting.

Potato tubers eyes which are infact dormant buds protected by small bracts. These buds germinate to give new plants. In the experiment performed by Mr. Jhon, the pieces which possessed eyes germinated and those without eyes did not germinate.

(i) The tuber has nodes and internodes.
(ii) Leafy shoots appear from the nodes.